git.m6w6.name Git - m6w6/libmemcached/blob - libmemcached/memcached_hosts.c

   1 #include "common.h"
   2
   3 /* Protoypes (static) */
   4 static memcached_return server_add(memcached_st *ptr, char *hostname,
   5                                    unsigned int port,
   6                                    memcached_connection type);
   7
   8 #define MEMCACHED_WHEEL_SIZE 1024
   9 #define MEMCACHED_STRIDE 4
  10 static void rebalance_wheel(memcached_st *ptr)
  11 {
  12   unsigned int x;
  13   unsigned int y;
  14   unsigned int latch;
  15
  16   /* Seed the Wheel */
  17   memset(ptr->wheel, 0, sizeof(unsigned int) * MEMCACHED_WHEEL_SIZE);
  18
  19   for (latch= y= x= 0; x < MEMCACHED_WHEEL_SIZE; x++, latch++)
  20   {
  21     if (latch == MEMCACHED_STRIDE)
  22     {
  23       y++;
  24       if (y == ptr->number_of_hosts)
  25         y= 0;
  26       latch= 0;
  27     }
  28
  29     ptr->wheel[x]= y;
  30   }
  31 }
  32
  33 static int compare_servers(const void *p1, const void *p2)
  34 {
  35   int return_value;
  36   memcached_server_st *a= (memcached_server_st *)p1;
  37   memcached_server_st *b= (memcached_server_st *)p2;
  38
  39   return_value= strcmp(a->hostname, b->hostname);
  40
  41   if (return_value == 0)
  42   {
  43     if (a->port > b->port)
  44       return_value++;
  45     else
  46       return_value--;
  47   }
  48
  49   return return_value;
  50 }
  51
  52 static void host_reset(memcached_st *ptr, memcached_server_st *host,
  53                        char *hostname, unsigned int port,
  54                        memcached_connection type)
  55 {
  56   memset(host,  0, sizeof(memcached_server_st));
  57   strncpy(host->hostname, hostname, MEMCACHED_MAX_HOST_LENGTH - 1);
  58   host->root= ptr ? ptr : NULL;
  59   host->port= port;
  60   host->fd= -1;
  61   host->type= type;
  62   host->read_ptr= host->read_buffer;
  63   if (ptr)
  64     host->next_retry= ptr->retry_timeout;
  65   host->sockaddr_inited= MEMCACHED_NOT_ALLOCATED;
  66 }
  67
  68 void server_list_free(memcached_st *ptr, memcached_server_st *servers)
  69 {
  70   unsigned int x;
  71
  72   if (servers == NULL)
  73     return;
  74
  75   for (x= 0; x < servers->count; x++)
  76     if (servers[x].address_info)
  77       freeaddrinfo(servers[x].address_info);
  78
  79   if (ptr && ptr->call_free)
  80     ptr->call_free(ptr, servers);
  81   else
  82     free(servers);
  83 }
  84
  85 memcached_return memcached_server_push(memcached_st *ptr, memcached_server_st *list)
  86 {
  87   unsigned int x;
  88   uint16_t count;
  89   memcached_server_st *new_host_list;
  90
  91   if (!list)
  92     return MEMCACHED_SUCCESS;
  93
  94   count= list[0].count;
  95
  96   if (ptr->call_realloc)
  97     new_host_list=
  98       (memcached_server_st *)ptr->call_realloc(ptr, ptr->hosts,
  99                                                sizeof(memcached_server_st) * (count + ptr->number_of_hosts));
 100   else
 101     new_host_list=
 102       (memcached_server_st *)realloc(ptr->hosts,
 103                                      sizeof(memcached_server_st) * (count + ptr->number_of_hosts));
 104
 105   if (!new_host_list)
 106     return MEMCACHED_MEMORY_ALLOCATION_FAILURE;
 107
 108   ptr->hosts= new_host_list;
 109
 110   for (x= 0; x < count; x++)
 111   {
 112     WATCHPOINT_ASSERT(list[x].hostname[0] != 0);
 113     host_reset(ptr, &ptr->hosts[ptr->number_of_hosts], list[x].hostname,
 114                list[x].port, list[x].type);
 115     ptr->number_of_hosts++;
 116   }
 117   ptr->hosts[0].count= ptr->number_of_hosts;
 118
 119   if (ptr->number_of_hosts > 1)
 120     qsort(ptr->hosts, ptr->number_of_hosts, sizeof(memcached_server_st), compare_servers);
 121
 122   rebalance_wheel(ptr);
 123
 124   return MEMCACHED_SUCCESS;
 125 }
 126
 127 memcached_return memcached_server_add_unix_socket(memcached_st *ptr, char *filename)
 128 {
 129   if (!filename)
 130     return MEMCACHED_FAILURE;
 131
 132   return server_add(ptr, filename, 0, MEMCACHED_CONNECTION_UNIX_SOCKET);
 133 }
 134
 135 memcached_return memcached_server_add_udp(memcached_st *ptr,
 136                                           char *hostname,
 137                                           unsigned int port)
 138 {
 139   if (!port)
 140     port= MEMCACHED_DEFAULT_PORT;
 141
 142   if (!hostname)
 143     hostname= "localhost";
 144
 145   return server_add(ptr, hostname, port, MEMCACHED_CONNECTION_UDP);
 146 }
 147
 148 memcached_return memcached_server_add(memcached_st *ptr,
 149                                       char *hostname,
 150                                       unsigned int port)
 151 {
 152   if (!port)
 153     port= MEMCACHED_DEFAULT_PORT;
 154
 155   if (!hostname)
 156     hostname= "localhost";
 157
 158   return server_add(ptr, hostname, port, MEMCACHED_CONNECTION_TCP);
 159 }
 160
 161 static memcached_return server_add(memcached_st *ptr, char *hostname,
 162                                    unsigned int port,
 163                                    memcached_connection type)
 164 {
 165   memcached_server_st *new_host_list;
 166   LIBMEMCACHED_MEMCACHED_SERVER_ADD_START();
 167
 168
 169   if (ptr->call_realloc)
 170     new_host_list= (memcached_server_st *)ptr->call_realloc(ptr, ptr->hosts,
 171                                                             sizeof(memcached_server_st) * (ptr->number_of_hosts+1));
 172   else
 173     new_host_list= (memcached_server_st *)realloc(ptr->hosts,
 174                                                   sizeof(memcached_server_st) * (ptr->number_of_hosts+1));
 175   if (new_host_list == NULL)
 176     return MEMCACHED_MEMORY_ALLOCATION_FAILURE;
 177
 178   ptr->hosts= new_host_list;
 179
 180   host_reset(ptr, &ptr->hosts[ptr->number_of_hosts], hostname, port, type);
 181   ptr->number_of_hosts++;
 182   ptr->hosts[0].count++;
 183
 184   if (ptr->number_of_hosts > 1)
 185     qsort(ptr->hosts, ptr->number_of_hosts, sizeof(memcached_server_st), compare_servers);
 186
 187   rebalance_wheel(ptr);
 188
 189   LIBMEMCACHED_MEMCACHED_SERVER_ADD_END();
 190
 191   return MEMCACHED_SUCCESS;
 192 }
 193
 194 memcached_server_st *memcached_server_list_append(memcached_server_st *ptr,
 195                                                   char *hostname, unsigned int port,
 196                                                   memcached_return *error)
 197 {
 198   unsigned int count;
 199   memcached_server_st *new_host_list;
 200
 201   if (hostname == NULL || error == NULL)
 202     return NULL;
 203
 204   if (!port)
 205     port= MEMCACHED_DEFAULT_PORT;
 206
 207   /* Increment count for hosts */
 208   count= 1;
 209   if (ptr != NULL)
 210   {
 211     count+= ptr[0].count;
 212   }
 213
 214   new_host_list= (memcached_server_st *)realloc(ptr, sizeof(memcached_server_st) * count);
 215   if (!new_host_list)
 216   {
 217     *error= MEMCACHED_MEMORY_ALLOCATION_FAILURE;
 218     return NULL;
 219   }
 220
 221   host_reset(NULL, &new_host_list[count-1], hostname, port, MEMCACHED_CONNECTION_TCP);
 222
 223   /* Backwards compatibility hack */
 224   new_host_list[0].count++;
 225
 226   count= new_host_list[0].count;
 227
 228   if (new_host_list[0].count > 1)
 229     qsort(new_host_list, count, sizeof(memcached_server_st), compare_servers);
 230
 231   new_host_list[0].count= count;
 232
 233
 234   *error= MEMCACHED_SUCCESS;
 235   return new_host_list;
 236 }
 237
 238 unsigned int memcached_server_list_count(memcached_server_st *ptr)
 239 {
 240   if (ptr == NULL)
 241     return 0;
 242
 243   return ptr[0].count;
 244 }
 245
 246 void memcached_server_list_free(memcached_server_st *ptr)
 247 {
 248   server_list_free(NULL, ptr);
 249 }